export default {
  // 为当前模块开启命名空间
  namespaced: true,

  // 模块的 state 数据
  state: () => ({
    // 购物车的数组，用来存储购物车中每个商品的信息对象
    // 每个商品的信息对象，都包含如下 6 个属性：
    // { goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state }
    cart: JSON.parse(uni.getStorageSync('cart') || '[]')
  }),

  // 模块的 mutations 方法
  mutations: {
    addToCart(state, goods) {
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
      if (!findResult) {
        state.cart.push(goods)
      } else {
        findResult.goods_count++;
      }
      this.commit('m_cart/saveToStorage')
      console.log('addtoCart--', state.cart)
    },
    saveToStorage(state) {
      uni.setStorageSync('cart', JSON.stringify(state.cart))
    },
    updateGoodsState(state, goods) {
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
      if (findResult) {
        findResult.goods_state = goods.goods_state;
        this.commit('m_cart/saveToStorage')
      }
    },
    updateGoodsCount(state, goods) {
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
      if (findResult) {
        findResult.goods_count = goods.goods_count;
        this.commit('m_cart/saveToStorage')
      }
    },
    removeGoodsById(state,goods_id){
      state.cart = state.cart.filter(x => x.goods_id !== goods_id);
      this.commit('m_cart/saveToStorage')
    },
    updateAllGoodsState(state,newVal){
      state.cart.forEach( x => x.goods_state = newVal)
      this.commit('m_cart/saveToStorage')
    }
  },

  // 模块的 getters 属性
  getters: {
    // 统计购物车中商品的总数量
    total(state) {
      return state.cart.reduce((total,item)=> total += item.goods_count,0)
      // let c = 0
      // // 循环统计商品的数量，累加到变量 c 中
      // state.cart.forEach(goods => c += goods.goods_count)
      // return c
    },
    checkedCount(state){
      return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count,0)
    },
    checkedGoodsAmount(state){
      return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count*item.goods_price,0).toFixed(2)
    }
    // total(state){
    //   let c = 0;
    //   state.cart.forEach(item => c+=item.goods_count)
    //   return c;
    // }
  },
}
